unix编程——posix消息队列

两个简单的消息队列发送和接受的例子：

send.c:

#include <stdlib.h>
#include <stdio.h>
#include <mqueue.h>
#include <sys/stat.h>
int main()
{
    mqd_t mqd;
    struct mq_attr attr;
    int flags;
    flags = O_RDWR | O_CREAT;
    mqd = mq_open("/temp.1234",flags,S_IRUSR|S_IWUSR|S_IROTH|S_IWOTH,NULL);
    mq_getattr(mqd,&attr);
    mq_send(mqd,"abc",3,0);
    mq_close(mqd);
    exit(0);
}

recv.c

#include <stdlib.h>
#include <stdio.h>
#include <mqueue.h>
#include <sys/stat.h>
int main()
{
    mqd_t mqd;
    struct mq_attr attr;
    char*buff;
    unsigned prio;
    ssize_t n;
    int flags;
    flags = O_RDWR | O_CREAT;
    mqd = mq_open("/temp.1234",flags,S_IRUSR|S_IWUSR|S_IROTH|S_IWOTH,NULL);
    mq_getattr(mqd,&attr);
    buff = malloc(attr.mq_msgsize);
    n = mq_receive(mqd,buff,attr.mq_msgsize,&prio);
    printf("%ld b, %s ,pri = %u\n",(long)n,buff,prio);
    mq_close(mqd);
    exit(0);
}

linux下编译运行：

gcc -o send send.c -lrt

gcc -o recv recv.c -lrt

./send

./recv

输出：

3 b, abc ,pri = 0